sundog

[suhn-dawg, -dog]
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noun

a small or incomplete rainbow.

Origin of sundog

First recorded in 1625–35; origin uncertain
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for sundog

sundog

noun

another word for parhelion
a small rainbow or halo near the horizon
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for sundog
n.

"mock sun, parhelion," 1650s, of obscure origin.

Online Etymology Dictionary, © 2010 Douglas Harper